• 22-year-old defender signs four-year deal for Slaven Bilic’s team • Frenchman says playing with Dimitri Payet will be ‘crazy’ West Ham have added to their defensive options before the new Premier League season with the signing of the left-back Arthur Masuaku from Olympiakos. The 22-year-old’s arrival was announced on Monday, with the manager Slaven Bilic confirming after Sunday’s friendly defeat to Juventus that a deal was close. Related: Cheikhou Kouyaté sets West Ham’s Olympic record in win …